CN85109266A

CN85109266A - Rotary mower and parts thereof

Info

Publication number: CN85109266A
Application number: CN85109266.7A
Authority: CN
Inventors: 塞克·文格·彻
Original assignee: Individual
Current assignee: Individual
Priority date: 1984-11-28
Filing date: 1985-11-27
Publication date: 1986-09-03
Also published as: US4736573A; EP0235142A1; DK485488D0; DK485488A; US4860525A; AU3819189A; IN164730B; DK354386A; CN1005085B; AU614161B2; AU583084B2; CA1278689C; DK354386D0; WO1986003092A1; DK156287C; NO862911L; DK156287B; NO862911D0; MY103512A; AU5200486A

Abstract

Improved protective cover and the blade assembly in addition that are used for rotary mower; Wherein protection is covered with a whole back skirtboard and the front valance panel of the porose seam installed by the protective element cantilever of three kinds of methods designs; Wherein cutting blade is rotary-type, and cutting blade has brake device, is designed to when the rotating blade pivot lost efficacy, and the operator is sounded a warning; Blade is replaceable and do not need to dismantle knife rest; The aperture is arranged in order to regulate the counterweight of rotating blade on the blade, form the variable arm of force.Also provide the improvement of interchangeable bit to design to propeller blade and rotary-type blade.

Description

Rotary mower and parts thereof

The present invention is relevant for rotary mower, specifically about rotary mower and its parts, as cutting blade and protective cover.Rotary mower can be categorized as: the airlift type of rotary cutter sheet is housed, also has an air cushion, mower is supported on the plant that will cut by air cushion; Non-airlift type, for example artificial Si Jumo mower (Strimmer) that supports is carried on the back the shoulder the operator usually, and common ground supports slides or wheeled construction.

Long-term next, people recognize the safety that will note rotary mower, to operator and onlooker's danger.Cutting blade is often surpassing the rotating speed rotation that per minute 4500 changes, and collides when object and blade, and the object band considerable energy and outwards dished out, or owing to metal fatigue makes blade breakages, self becomes the missile of a danger.

A large amount of suggestions was earlier once arranged, seek to make this danger to be kept to minimum.And many suggestions, for example United States Patent (USP) 3,971, for the wheel-mounted machine of a non-airlift, cutting blade are closed in 199, and this method has adverse influence to cutting efficiency.The security measure that seriously weakens the mower cutting efficiency is only admitted by limited user.According to United States Patent (USP) 3,971,199 records, 1973 in 30,000 accident reportings relevant that American public health service department proposes with mower, the 30%th, due to rotating blade dishes out object.

Many Si Jumo mowers (Strimmer) have the convenience that replaces the Metal Cutting blade with a flexible nylon rope, are used to repair the plant of contiguous wall and other surface of solids then, and these surfaces may make metal blade damage.The rotary mower that I invented can have this convenience equally, usually protective cover is removed, and replaces cutting knife and blade with rope, or is installed on the cutting knife, or be installed on the blade.

Therefore, I like the cutting blade with an inflexibility, and it can be moulding material metal or hard, as nylon and so on, then with being pivotally mounted on the cutting knife.The histogram that goes out illustrated in figures 1 and 2 has compared the distance that the equal weight test specimen is dished out, test specimen devotes respectively on the track and the track with the cutting blade of pivotal mounting of propeller shape cutting blade, the diameter of blade top ends track equates, and rotate with the speed drive that equates, these histograms distance of representing significantly not only on average to dish out serve as big with irrotationality rotating shaft blade, and maximum is dished out apart from also bigger.Use the Different Weight test specimen then,, get the risk distance (radius) of making this weight test specimen with the maximum distance that test specimen in each test is dished out to irrotationality rotating shaft and rotating shaft blade repeated test; And hazardous area (area) is 2.1 to 1 to 12 grammes per square metre test specimen ratios of impelling farthest; 31 grammes per square metre test specimen ratios of impelling increase to 3.0 to 1 farthest, and 47 grammes per square metre test specimen ratios of impelling are 8.5 to 1 farthest.Therefore with the cutting blade of pivotal mounting, known in 234 for example from United States Patent (USP) 3,815, the onlooker is provided the improvement of a sizable secure context; United States Patent (USP) 3,815,234 have also proposed a coupling arrangement, with cutting blade the swaying with respect to cutting knife of limiting permission.Adopt pivot blade to also have advantage, can prolong the life-span of drive unit, because drive unit does not bear the reaction force of the impact load of same degree.Yet the structure that I proposed surpasses United States Patent (USP) 3,815,234, improves and have more significantly.For example my cutting blade is installed on the cutting knife with a sleeve pipe, sleeve pipe is wideer than cutter, so in use blade can vibrate arbitrarily, or when static, can lever up arbitrarily, and unlikelyly contact with cutting knife, even so green grass and rubbish are in use arranged between cutting knife and cutter, the same promotion rotatablely moves.Cutting blade is stacked in a setting element for example on the packing ring, plays the restriction cutting blade and shifts out in the cutting knife plane.The brake device that I provided can be braked the rotation of cutting blade when pivot breaks, and the driving that remains to cutting knife at least is stopped, or is cut off.The brake device of cutting knife and cutting blade can connect and needn't require at first cutting knife to be removed.In addition, brake device was designed to when pivot lost efficacy, and in time gave a warning to the operator.Preferably, brake device is design like this, one cutting blade is in a plane, one first opening is arranged to be placed on the pivot that drives by cutting knife, usually do not contact with the braking tongue that drives by cutting knife with an arcuate socket, tongue set is in passing the arcuate socket projection outside, one wall in tongue and hole has formed described brake device, limit rotatablely moving of cutting blade with a jockey, one end in hole contacts with tongue, stoping the too early impact fracture of tongue and to damage brake device subsequently, and may the person of not being operated notice that the part in hole is between cutting blade pivot and cutting knife axle.

Therefore according to my characteristic of invention, I provide a knife assembly that is used on the rotary mower, include the cutting knife of a turning cylinder, a cutting blade that drives by cutting knife, and a cut surface is arranged; One is used for cutting blade is installed in cutting knife, so that the cut surface on the cutting blade can outwards rotate, when blade rotates with knife rest, under centrifugal action, break away from cutting knife, brake device on the cutting knife engages with the cutting blade that loses described pivot support frame under described centrifugal action.Be characterised in that the cutting blade on the cutting knife, can be replaced and do not need to lay down cutting knife, according to my another characteristic of invention, the knife assembly that is used for rotary mower that I provide, comprising can be around the cutting knife of a rotation, one cutting blade has a cutting surface, one is used for cutting blade is installed in pivot support frame on the cutting knife, make the cut surface on the cutting blade outwards to rotate, when blade and knife rest rotate together, break away from cutting knife under centrifugal action, the brake device on the cutting knife engages with the cutting blade that loses described pivot support frame under described centrifugal action, be characterised in that, be that a tongue engages with one side of slotted hole in the brake device, cutting knife comprises in tongue and the slotted hole, and cutting blade comprises tongue and slotted hole another.

Preferably the brake device on the cutting knife is a tongue of erectting from cutting knife, cutting blade then has the long arc-shaped holes of its center at the pivot support frame place, tongue extends into slotted hole, and sway with the cutting blade of set jockey limiting permission, when described swaying, stop to engage with tongue with an end of slotted hole.

Although mower can be applied to different types of plant, typical a requirement is that cutting contains the grass of moisture, cutting fibrous in the fall grass in spring.Proposed to change the suggestion of cutter blade, and as United States Patent (USP) 3,320,733, and a kind of blade that I advised, can change and do not need blade is removed from machine for this blade cuts performance.

Therefore the invention according to us also has other characteristic, I provide one to be used for rotary mower cutting knife assembly, it comprise one can be around cutting knife and cutting blade of drive shaft turns, with being pivotally mounted on the cutting knife, be characterised in that the removable counter weight device that can be installed on the cutter, to allow to adjust the arm of force of cutting blade.Therefore, I advise adjusting the weight of cutter blade and/or distribution of weight to adapt to the plant of required cutting.Preferably cutting blade has one or more aperture, can place counterweight therein selectively.Like this, for example want cutting fibrous grass, I can use a heavier blade or leave rotating shaft blade far away with a center of gravity.The advantage of my structure is that rotating blade is arranged, and is to be adjusted with the characteristics of the blade of pivotal mounting and does not need the blade of dismantling.Also have an additional advantage, the cutting knife assembly can not need as the parts with these characteristics, drives with very high rotary speed during cutting fibrous grass.

In another embodiment, can provide a removable cut surface, and this cut surface can be various weight.Therefore the invention according to me also has another characteristic, I provide a blade assembly that is used for rotary mower, has a cutting knife, the drive unit of cutting knife, with a cutting blade with being pivotally mounted on the cutting knife, it is characterized in that wherein cutting blade has the cutting surface that can change.

As an additional features, I provide a blade assembly that is used for rotary mower, has a base, can be around a drive shaft turns, one cutting blade has a cutting surface and cutting blade is installed in device on the cut surface removably, described device comprises the axially spaced-apart element of pair of upstanding, one of them described element closes with first edge joint of the cutting blade that faces toward cut surface, the described element of another one connects second limit facing to the cutting blade on first limit, and cut surface is axially spaced, be characterised in that: cutting blade contains a concavity notch portion at least, be applicable to and put into a described described element, with fixed cutting blade, opposing centrifugal force when rotation.An advantage of my structure is: cutting blade is that the top can be radially inwardly displaced substantially, is its support and do not influence base.

The file of existing many officials is positioned at about stone and other free object and is clashed on the track of cutting blade and dished out by machine, to onlooker and the adventurous problem of operator, the research that the U.S. may cause injuring about various missiles in 1974, and be described in detail in June, 1976 in the report of Consumer Product Safety Commission, annex 2 is pointed out for the 7th page, little, hard, the object of point, for example iron wire and glass fragment are the main objects in most of missile incidents of injury that is involved in, " may be owing to penetrate people's muscle and bone easily with the iron wire of high-speed motion; sometimes, this penetrating protrudes into fatal organ and cause death ".A revised standard that is used to throw the object test is used, wherein topped the testing surface of simulated grass, surrounded by an octagon wall as target, when mower is operated, 300 nails drop into upwards input blade of point from 6, each drops into point and is positioned at blade top circumference 2.54 centimeters, and concordant with testing surface.Decide machine whether to meet standard by target numbers of being hit by nail and position, nail hits the operator zone then by more important place punishment.This standard is set up, although countless machine can be used to test, only has one to meet revised standard, and because cutting efficiency is not a part of this revised standard, so there is not index to show that this machine is effective aspect mowing.Through after the very long test; I reach a conclusion; in order to meet U.S.'s revised standard of projection object test; and don't mower efficient is obviously descended; the mowing protective cover will comprise many protective elements; cantilevered is installed a part and the skirtboard part that forms the protective cover top cover; guiding green grass is towards cutter; and for protect the operator in the operator zone, to have at least 160 the degree entities be the atresia skirtboard; yet to only belonging to the wheeled mower that moves to the dead ahead; it is useful increasing angle, such as being increased to 200 degree.With United States Patent (USP) 4,069,651 applications are made comparisons, my skirtboard part does not have the hole in the operator zone, and makes comparisons with the application of Canadian Patent 984,602, my protective cover element is cantilevered, so when being impacted the blade thing and hit by one, can stop and can become curved.The protective cover of an obvious spaced protective element is not suitable for the airlift rotary mower.When testing my protective cover with a hanging Si Jumo mower of shoulder (Ttrimmer), I am placed on the test surfaces 5.08 centimetres (2 inch) to the height of blade and locate, because this is an A.N.S.I.(ANSI) height of defined in the test jobs.Revised standard notes punishing the degree of scattering of test object usually, and does not specify the height of blade, only requires blade to be in the extreme higher position that this machine may reach.Higher height can not be represented the length of the green grass that will cut usually, and a lower height means that many test object are hit before they leave testing surface, so be not normal impact, it seems that given result of the test be good, and be false.

According to my characteristic feature of an invention, I provide a protective cover for the cutting blade of non-airlift type rotary mower, form by a top cover and skirtboard, skirtboard has first parts that have aperture, circumferential interval and does not have second parts in aperture, described circumferential interval, is characterised in that, many protective elements are arranged, each element comprises a supporting leg and a finger piece, and supporting leg constitutes the part of top cover, and finger piece constitutes described first parts.Preferably the circumferential width that has of each protective element is less than the interval between the adjacent fingers.It is practical that protective element forms in pairs, and an elasticity fast-assembling pawl or hook are arranged.The spacing of adjacent fingers is preferably such, and the tangent line of blade end track is wanted several finger pieces of crosscut at least between the described finger piece.In order to limit the number of times that the collision thing of interception in skirtboard is rotated cutter blades impact, connect in the middle of second its circumferential spacing ends of parts, preferably from radially outward at least 2 centimetres of blade end tracks.Protective element can be in a plane, so that provides one to be generally rectangular barrier to the collision thing.Preferably make two the adjacent elements of end that enter second parts that second parts at first run into blade, supporting leg and finger piece than remaining those element has a bigger size just make progress, increase downwards and outwards.My protective cover is to assemble with standard package easily, and this combining structure has above-mentioned advantage, if paired protective element is not necessarily identical, and this element can individually be changed.The element that is suitable for my protective cover, three kinds of different designs are arranged, as above mentioned, with skirtboard one end that at first runs into the rotation cutting blade in the operator district, immediate two protective elements, have the size bigger than standard component, and at two protective elements of the other end of operator district skirtboard, have the size bigger than standard component, and at two elements of the other end of operator district skirtboard, just those rotate those two protective elements that cutting blades leave at last, and their radial extremity is positioned at one, and to connect contiguous protective element be useful to the datum line of skirtboard, to form anti-safe edge always, be applicable to the condition of for example cutting along wall.Right for last-mentioned protective element, in order to guarantee the suitable dimension of protective element, especially determine the finger piece that dangles of the appropriate section of the first skirtboard parts, protective element has curved supporting leg, its end becomes an outside angle with operator district skirtboard, when the operator along the wall mobile apparatus forward the time, this direction has the guiding of help will cut the advantage that green grass enters machine.

The object that is cut the blade collision still can fly out from my protective cover, but kinetic energy has reduced.Because my test shows, before being dished out in the skirtboard in operator district by collision object, may clash into more than once.I recommend, and the smallest radial spacing is at least 2 centimetres between blade top and the skirtboard, and rotates skirtboard one end that cutting blade leaves at last in the operator district, forms a ledge inwards.

Thereby according to my the other characteristics of invention, I provide a rotary mower to comprise: a rotating cutting knife, the drive unit of cutting knife, one cutting blade is with being pivotally mounted on the cutting knife, cut surface on the blade radially outwards protrudes out and exceeds outside the cutting knife like this, device on the described cutting knife and described pivot support frame are spaced apart, and connect with cutter, cutting blade separates with cutting knife to stop in use, and protector comprises a skirtboard, and cutting blade rotates therein.

Fig. 1 is that a histogram has write down the distance of test object being dished out with common propeller type blade;

Fig. 2 is that a histogram repetition Fig. 1 is described, but adopts a rotating shaft blade;

Fig. 3 is the partial side view of a Si Jumo mower (Strimmer) whirler, has rotating shaft cutting blade and modular guard cover;

Fig. 3 A is the enlarged drawing of the another kind of installation method of protective cover shown in Fig. 3;

Fig. 4 is that the pivot support frame of rotating blade amplifies details drawing;

Fig. 5 is the pivot support frame plane of cutting knife-cutting blade, but the nut among Fig. 4 42, spring washer 40 and pad 38 remove;

Fig. 6 is the plane on removable cutting blade top on the base 66;

Fig. 7 is the partial sectional view of the embodiment of the another one replaceable cutter head that has alignment pin.Along VII among Fig. 6-VII line intercepting;

Fig. 8 is the back protecting component;

Fig. 8 A is the partial sectional view of an amplification of the back protecting component blade port of export;

Fig. 8 B is the partial sectional view of an amplification of back protecting component blade entrance point;

Fig. 9 is preceding protecting component, shows the end, circumferential interval with respect to the back protecting component;

Figure 10 is forepiece first protective element;

Figure 11 is forepiece second protective element;

Figure 12 is forepiece the 3rd protective element;

Figure 13 is improved protective element, on supporting leg and the finger piece triangular flanges is arranged.

Rotary mower comprises a support portion 2 as shown in Figure 3, knife assembly 4 and cutting protective cover 6.Support part 2 in this embodiment has braces hook (not shown), thus machine be artificial brace type Si Jumo mower (Strimmer) and in other embodiment support part 2 can be installed on wheel or the slide plate.My improved knife assembly 4, for example cutting blade forms with rotating, and can use with the air lift on being supported on an air cushion equally.

Support part 2 has a hollow pipe 10, and axle 12 is mounted in it, and for example petrol engine or electro-motor drive rotationally with prime mover (not shown).Axle 12 is connected with power transmission shaft 16 by gear 14, and power transmission shaft 16 usefulness ball distance rings are rotatably supported in the support 2.Power transmission shaft 16 is equipped with a location sleeve pipe 20, can rotate the end of thread 24 of a packing ring 22 and a nutting 26 along with power transmission shaft 16 together; In this embodiment, knife assembly and after unloading lower nut 26, can be used as an accessory and removes between the convex shoulder and packing ring 22 of locating sleeve 20.

In the embodiments of figure 3, protective cover 6 is supported by forming holistic annular support 200 again with the support part; And in another embodiment, as seen, support 200 is to be fixed on removably on the support part 2 with screw 201 from Fig. 3 A.

Knife assembly 4 comprises a cutting knife 30 and a pair of cutting skill in using a kitchen knife in cookery 32, with being pivotally mounted on the knife rest 30.When rotating around driving shaft 16, cutting blade 32 radially extends beyond outside the cutting knife 30 under centrifugal action.Cutting blade 32 is to be contained in rotationally on the cutting knife 30 with equilibrium form; Two cutting blades 32 are mounted in radially on the relative position in this embodiment, and in embodiment in addition, can adopt three or multi-disc blade more.

Pivot support frame shows more clearly in detail drawing 4, and pivot sleeve pipe 34 is on the bolt 36 between cutting knife 30 and the packing ring 38, and pivot sleeve pipe 34 stops it to rotate with the spring washer 40 of nut 42 back.For example a free object is cut blade 32 collisions when power transmission shaft 16 rotates, and pivot sleeve pipe 34 allows corresponding cutting blade 32 to rotate with respect to cutting knife 30; The thickness of each pivot sleeve pipe 34 is big than the thickness of cutting blade 32, so allow the blade vibration, dispose the weeds of various accumulations, or rubbish, or iron rust, if cutting knife 30, one or several in cutting blade 32 and the packing ring 38 is made up of ferrous materials, and for example machine lay on the table winter.Packing ring 38 also has following other effects that will address.

Each cutting blade has an end face 44, matches with the lug 46 of projection on cutting knife 30, and the permission of restriction blade is rotated, and for example is limited to about 90 °; In the other embodiment shown in Fig. 3, sleeve pipe 20 jockey therewith plays a part same.In addition, when one or several cutting blade 32 when end face 44 rotates, end face 44 is to be one section circular arc that radially extend at the center with pivot sleeve pipe 34, expose this or that chamber 48, chamber 48 is rammed downwards from cutting knife 30, in use, the rubbish foreign material that are deposited between cutting knife 30 and the corresponding cutting blade 32 can be eliminated with blade; Therefore, when blade rotation to extreme position with when stopping to drive, foreign material can clear out from chamber 48.Each chamber 48 respectively has a complete bottom, enters gap location between cutting knife 30 and the cutting blade 32 from the bottom to stop sand or gravel when rotary mower uses.

Each cutting blade 32 all is in a plane, and contains an arcuate socket 50, on the axis that is centered close to pivot sleeve pipe 34 in hole.From cutting knife 30 projections be tongue 52, tongue stamps out from cutting knife 30 in this embodiment; And in a further embodiment, tongue is a metal strip thing, is welded on the cutting knife 30; Tongue is to form with the unthreaded portion that is contained in the bolt on the cutting knife among the another embodiment.During normal use, leave the gap between the side 54 of arcuate socket 50 and the tongue 52, when end face 44 engaged the permission rotation of restriction blade with projection lug 46, arcuate socket end margin 56 also and between the tongue 52 left the gap; So tongue 52 is the taking up wear load that also do not withstand shocks neither, wearing and tearing and impact can cause tongue to be cut or rupture, and are not realized by machine operation person.If the pivotally connected inefficacy between cutting knife 30 and the cutting blade 32 in use, cutting blade will be along radially outward flying out under centrifugal action, collide and be prevented from up to side 54 and tongue 52.Because arcuate socket is that tongue in the cross section shown in the reference line 58, will not produce a significant eccentric load with side 54 contacting of any position in Fig. 5 by the axis of pivot sleeve pipe 34 radially inwards.Alert operator, and leave the time of closing or cutting off prime mover.Other advantages of my structure are: cutting knife and cutting blade simple in structure, can change blade, during as needs, cutter head 64(Fig. 6 for example is installed), only need lay down pivot, and not need to dismantle cutting knife.

The (not shown) tongue can be located on the cutting blade in another embodiment, and the hole is located on the cutting knife.

Pad 38 topped arcuate socket 50, prevent that green grass and foreign material are deposited between cutting knife 30 and the blade 32.Pad 38 has a slit 39, puts into tongue 52, pivot cut or other failure conditions under, but blade 32 plays an additional stop device.

Aperture 60 is arranged on the cutting blade 32, can put into the counterweight (not shown) therein selectively, adapt with the arm of force and the mowing condition of work that changes cutting blade 32.When adding counterweight, prime mover does not need to drive with the higher speed of cutting the required usefulness of fibrous grass usually, on the contrary, if plant is fresh as grass, the blade that adds counterweight can not improve mowing efficient, and increase the cast and the hazardous area of collision object, so need remove counterweight.

In another embodiment, knife assembly 4 can comprise a removable cutter head 64.For this reason, as can be seen from Fig. 6, go out two rightabout hook elements 68 and 70, respectively have projection limit 72,74 and

lap

76,78 in facing, cutter head 64 is compressed and is securely fixed on the base plate 66 from base plate 66.The lap 78 of radially outer hook elements 70 forward, even the also rotation direction of time spent is extended; The lap 76 of hook elements 68 extends back.And be generally rectangular base plate 66 side 80,82 is arranged, form a kerf in hook elements 70 the place aheads, so can not influence the effect of the cut surface 84 of replaceable cutter head 64.

Plan cutter head 64 two sides can be used, so one second cut surface 86 is arranged.

Removable cutter head 64 has one first end 88 to join with side 90 and 92 and one second end 94 joins with

side

96 and 98; Second end 94 is setovered forward by direction of rotation with respect to first end 88.The distance at

side

90,92 and 96,98 intervals equates, but less than the spacing between the opposite edges 72,74 of projection, so cutter head 64 can guide by first end 88, be positioned between the opposite edges 72,74 of projection best and base plate 66 sliding-contacts.

Side 9298 and side 90,96 connect by concavity notch portion 100,102 respectively, form the grab of a pair of axially spaced-apart, and its axial spacing is less than the axially spaced-apart between the raised edges 72,74.

During rotation, notch portion 102 surrounds raised edges 74, overcomes fixedly cutter head of centrifugal force and tangential motion; And when stopping operating, when changing cutter head 64, notch portion 102 can be from raised edges 74 slippages; Because as long as cutter head 64 to short distance of front slide, just can be thrown off with edge 74,, and do not need at first dismounting base plate 66 from machine so cutter head 64 can be replaced.In another embodiment, cutter head 64 and lap 78, one concentric holes can be arranged, putting into a dismountable alignment pin 104 exists, alignment pin 104 can also play a counterweight, and can adopt any form easily, for example nuts and bolt, be by a head 106 and unthreaded portion 108 shown in two figure, for example form by a pair of radially relative vertical hole (not shown).Head 106 is spacer assemblys, stops cutter head 64 with respect to base plate 66 motions.This shows, in the operation, come cutting plants with cut surface 84, the direct load that transmits from cut surface 84 distributes along claw 70, and claw 68 constraints are lived cutter head 64 in the following rotation that will take place of this load action.Base plate 66 can rotate around pivot 65.

The edge, back 67 of base plate 66 is (not shown) of perk up in another kind of embodiment, grass is cut is cut (not shown) in the collecting bag to form an air-flow.

Base plate 66 can be fixed on the propeller type blade in another kind of embodiment.

Protector 6 is combining structures, has a back protecting component 110(Fig. 8) and a preceding protecting component 112(Fig. 9) by protective element 114,116,118 form.

Back protecting component 110 has the skirtboard 122(Fig. 3 in a no aperture) spend the diagonal angle with 16 one-tenth of driving shafts-160.In this embodiment, back skirtboard extends 3.5 centimetres downwards by plane, cutting blade 32 place, and then protecting component 110 top covers 124 exceed 0.8 centimetre than blade plane.Suggestion Si Jumo mower (Ssrimmer) to be keeping mowing about a little angle with the horizon, thus when from the place ahead or the rear look, one side is lower than another side alternately with each other; The skirtboard end 126 with angle of back protecting component 110 helps to mow, and makes cutter head more approach ground, and the big degree of depth skirtboard of being advised does not still hinder mowing efficient.

Yet the free object of great majority collisions is to be vertically projected on the blade of blade, and my test shows some test object, penetrates with a unimaginable angle by twice of bump and from back protecting component 110 at least.Multiple impact to occur in order being limited in the protecting component 110 of back,, to leave one 2.5 centimetres of gaps between cutter head and the skirtboard 122 at the periphery of parts 110; In addition, cutting blade rotates with the direction shown in the arrow among Fig. 8 130, and preferably from Fig. 8 A, the end 128 of the skirtboard 122 that cutting blade is left away at last forms an inside inclination angle, so stop free object around the inboard spring of skirtboard.Diameter is 18 centimetres a skirtboard, and the internal diameter of end 128 is 16.5 centimetres, with the spacing of cutter head be 1.0 centimetres.

On the contrary, preferably from Fig. 8 B, hold 132 one-tenth one outside inclination angles, diameter is 20.0 centimetres, and have a raised face (RF) 133 to extend beyond on the contiguous protection top cover 124 1.5 centimetres, so afterwards the rammer body in 132 couples of directive operators district, end of protecting component 110 has formed a barrier.Like this, the free object in directive operator zone can be comprised that face 133 shelters from better by the end 132 of back protecting component.

Back protecting component has three pilot holes 134, wherein puts into screw 136(Fig. 3), in order to removably back cover part is fixed on the support 2; Perhaps, removably bonnet is fixed on the supporting base 200 as the embodiment among Fig. 3 A.Top cover 124 is to be an entity, but in a further embodiment, can be porose, to alleviate the weight of back protecting component 110.

As shown in Figure 9, preceding protecting component 112 comprises many paired protective elements 114,116,118, so if an element is damaged, can not need to change whole preceding protecting component.These elements are contained on the support 2 with cantilevered fashion, flexibly be positioned at hoop 140,142 below, hoop 140,142 forms as if whole filler rings with support 2, and by grab 143 location; Yet hoop can separate in a further embodiment, is welded in separately on the support 2.

Protective element 114(sees Fig. 3, Fig. 9 and Figure 10) a supporting leg 144a is radially respectively arranged, it is 6.0 centimetres that supporting leg 144a has a radical length, vertical dimension is 2.0 centimetres augmenting portion 146a; Extend 0.3 centimetre with a finger piece 148a who dangles downwards from the plane of cutting blade 32.The radical length of finger piece 148a be 1.5 centimetres at root, and lower edge is 1.0 centimetres, and the radial spacing between cutter head circumference and the following finger piece edge herein is 1.5 centimetres.

Near protective element 116(Fig. 9 of back protection ends 132, Figure 11) have the external diameter (20 centimetre) identical with end 132.The radical length of augmenting portion 146b thereby be 8.0 centimetres; The size of its vertical direction is increased to 3.5 centimetres, and keeps 0.8 centimetre of spacing with the cutter plane.The root radical length of finger piece 148b and lower end radical length but are 3.5 centimetres, so finger piece 148b normally is a rectangle; Radial spacing between cutter head circumference and the finger piece lower limb is reduced to 1.0 centimetres.The finger piece lower end extends under the plane, cutting blade 32 place 3.0 centimetres.Therefore, these two protective elements 116 provide a barrier bigger than protective element 114 to the free flight thing, although protective element 116 is to form a straight line between cutting blade 32 and operator zone.

The supporting leg 144c of two protective elements 118 extends to the imaginary line 145 that the end 128 and first that connects the back protecting component is ordered protective element 114 mutually, so the radial extremity of two protective elements 118 forms a straight flange with first radial extremity of ordering protective element 114 mutually, this is to beneficial when metope or analog are mowed.Supporting leg 144c has an inclination angle, when rotary mower moves forward, the grass that will cut along metope is guided into rotation cutting blade 32.Because supporting leg 144c has an inclination angle, the radial spacing between cutter head circumference and the finger piece lower limb reduces as protective element 116, and the protective element 118 of appointment is except protective element 114 corresponding sizes.The additional strength of protective element 118 can be by formation shown in Figure 13 (hereinafter setting forth).In order to make the cutter head of the more close blade 32 of datum line, so that more close " wall " limit, terminal 128 radius is reduced to 17.0 centimetres in this embodiment.

The length of (not shown) protective element 118 can be different significantly in other embodiment, leave end 128 element farthest during use than growing and being bent away from terminal 128, so that more promptly grass is introduced the track of cutting blade, will " brush up against " element end (not being element 114) and element 118 another paired elements from terminal 128 directrixes of setting 145 and can be curved curved or make flat easily.

From Fig. 9 as seen, the circumferential width that each protective element had is less than the spacing between contiguous finger piece; Free object along the tangent line of blade end circumference penetrates need pass through two supporting legs 144 at least from dishing out between two contiguous finger pieces, and radially inwards position dishes out and must pass through 5 supporting legs 144 from the end circumference.Distance between the adjacent fingers 148 can not be above 5.0 centimetres.Therefore, can contact with for example one or several augmenting portion 146 to have reduced kinetic energy from the rammer that protective cover is dished out, or contact, or contact with aforementioned both with the finger piece 148 that dangles.As an added security energy, the skirtboard 122 of the atresia seam of my back protecting component, extend the Plane of rotation that is lower than cutting blade 32 downwards, this finger piece 148 extends lower, (see figure 3) it stoped projectile skirtboard upspring for 122 times and resilience hit the operator, simultaneously also allow Si Jumo mower (Strimmer) to turn forward, effectively cut the plant of between protective element 114, guiding.

Forming the finger piece 148 of the first skirtboard parts, is the place ahead and side at machine during use; And skirtboard 122 is imporous second parts, or is the parts that very small pores is arranged at least, and hole is too little of, little object enough big or enough heavy damage operators is passed through.Supporting leg 144 forms the protection header field with finger piece 148, and remaining top cover 124 links mutually with skirtboard 122.

In an additional embodiments, for higher intensity is arranged, also in order to reduce the circumferential spacing between the adjacent fingers, protective element 114,116, one or several in 118 can be provided with flange 120(Figure 13) preferably leg-of-mutton.

For sometimes as one for example the preceding protective element 114,116,118 of nylon rope Si Jumo mower (Strimmer) can remove, not hinder the cutting operation of nylon rope, back protecting component 110 can be retained on the original position.

Protective cover, especially each protective element 114,116,118 are preferably formed with anti-material that shake, resilient, lightweight, as nylon or Merlon.Protective element is connected on the annular support disk 200, and disk 200 has assembling slotted hole 202 retainer screws therefrom to pass.Slotted hole 202 allows protective element and back protecting component 110 with respect to support 2 a limited rotation adjustment to be arranged, the operator is provided the better protection effect.(not shown) disk 200 and back protecting component 110 can form an integral member in other embodiment.

Therefore, I have proposed a rotary mower, one inflexibility propeller blade is housed or rotates cutting blade, with the protective cover that a forepiece and a back part are arranged, forepiece is made up of the cantilevered protective element, and back part is made up of big degree of depth skirtboard, when spuious object clashes into to be equal to or greater than the design cutting load that rotates cutting blade, the speed of dishing out was little when this was clashed into rigidity screw cutting blade with the identical speed of identical object, so little to the harmfulness of protective cover.Because the impulsive force that acts on the rotary cutter sheet reduces, cutting blade can be crooked, oscillatory load and stress load to mower have reduced, and may reduce the maintenance requirement, need repair hardly, seldom frequent part exchanging, because cutting blade can bending will delay rust, seldom be easy to fracture, however, I have also provided a kind of removable cutter head, and it can be used for rotating blade and common revolving vane type blade; The device of the change rotary cutter sheet arm of force comprises the interchangeable bit part type of different counterweights; Cutting blade assembly comprises a cutting knife and a rotating blade, therefrom replaceable rotating blade and do not need to dismantle knife rest; A blade-cutting device comprises a knife rest and a rotating blade, wherein be provided with brake device separately, fixed blade when the centrifugal action bottom knife self has become flyer, brake device are designed to give a warning to the operator when pivot any form takes place lost efficacy; Protector not only gently but also be easy to dismounting, also allow the operator, no matter be and human or commercial using, cutting plants effectively, and provide bigger safety to operator and onlooker than the modern machines standard of US authorities, this shows that specified size can change, balance safety and cutting efficiency change; Short blade and " standard " protective cover will obtain good safety test result, and with cutting efficiency as cost.Know that also the isolator (not shown) can be enclosed between ball distance ring 18 and the sleeve pipe 20 (Fig. 3), can change blade height so that cut the grass of differing heights.

In a further embodiment, the protective element of first parts can be made single, or three, promptly be different from paired; Replace above-mentioned 3.5 centimetres, back skirtboard can extend to following 4.0 centimetres of plane, cutting blade 32 place; The part vertical dimension of 146B can be 4.0 centimetres; The radical length of finger piece 148B root and lower edge can be 4.0 centimetres; Spacing between adjacent fingers refers to can be 4.0 centimetres; Facade 133 radical lengths are 8.0 centimetres and extend beyond and close on 4.0 centimetres of top covers of protection that some or all forepiece protective elements 114,116,118 can form an integral body with bearing 200, and bearing 200 can be a complete annulus or separate fully, promptly encircle piece.

Claims

1, be used as a protective cover of cutting blade in a non-airlift mower, comprise a top and skirtboard composition, skirtboard has first parts, and the opening along the circle spacing is arranged on it; With second parts, there is not described opening on it along the circle spacing, be characterised in that some circumferentially spaced protective elements respectively contain a finger piece and a supporting leg, supporting leg constitutes the part of top cover, and finger piece constitutes the described first skirtboard parts.

2,, it is characterized in that circumferential width that each protective element has is less than the spacing between the adjacent fingers according to protective cover described in the claim 1.

3,, it is characterized in that protective element forms in pairs and an elasticity fast-assembling grab arranged according to protective cover described in the claim 1.

4,, it is characterized in that wherein adjacent finger piece is that the tangent line of blade end track between the described finger piece is wanted two supporting legs of crosscut at least so at interval according to the described protective cover of claim 1.

5, according to the described protective cover of claim 1, it is characterized in that second parts its circumferentially spaced in the middle of connector, at least along blade top end rail trace to outside 2 centimetres.

6, according to the described protective cover of claim 1, it is characterized in that one first protective element is arranged, one second protective element and one the 3rd protective element, second protective element has bigger supporting leg than first protective element, and the 3rd protective element has a curved supporting leg.

7, according to the protective cover described in the claim 1, it is characterized in that the size of the radial dimension of each supporting leg wherein greater than its vertical direction, to the object that goes out by the blade impelling, form one and be generally rectangular barrier.

According to the protective cover described in the claim 1, it is characterized in that 8, the angle of the first parts subtend protective cover axis is not more than 200 degree.

According to the protective cover described in the claim 1, it is characterized in that 9, second parts are at an end of its circumference, have the part that stretches out.

10, a protective element is for the usefulness of protective cover, as described in above-mentioned any one claim.

11, a cutter assembly is used for rotary mower, comprises that one can have the cutting blade of a cut surface around the cutting knife of a rotation; One pivot support frame is used for cutting blade is placed in cutting knife, make the cut surface of cutting blade outwards to rotate, when blade leaves cutting knife during around blade holder turns under centrifugal action, and the brake device on the cutting knife is under described centrifugal action, engage with the cutting blade that loses described pivot support frame, be characterised in that brake device is a tongue, can cooperate with the one side in hole, cutting knife one of comprises in tongue and the slotted hole, and cutting blade comprises the another one in tongue and the slotted hole.

12,, it is characterized in that slotted hole is the arcuate socket that is centered close to pivot holder for it according to knife assembly described in the claim 10.The part slotted hole is between pivot support frame and described axle.

13, according to knife assembly described in the claim 11, it is characterized in that limiting the rotation of the cutting blade that is allowed with coupling arrangement, the end prevention with slotted hole in rotation engages with tongue.

14, a cutting blade uses for knife assembly, and as described among the claim 11-13 any one, cutting blade has a long arc-shaped holes.

15, a cutting blade assembly is used for a rotary mower, can be comprising one around the cutting knife of a drive shaft turns, with the cutting blade drive unit that is pivotally mounted on the cutting knife, be characterised in that the device of on cutting blade, placing counterweight removably, to allow to adjust the arm of force of cutting blade, adapt to different mowing conditions.

16, one cutter assembly is used for a rotary mower, having one can be around the base of drive shaft turns, one cutting blade has a cut surface, cutting blade is contained in device on the cut surface removably, described device comprises the element of the axial spacing of pair of upstanding, one of described element engages with first limit of the cutting blade that faces toward cut surface, the described element of another one connects second limit facing to the cutting blade on first limit, but it is axially spaced with cut surface, be characterised in that cutting blade comprises a concavity notch portion at least, be suitable for surrounding the described first described element, opposing centrifugal force is fixed cutting blade when rotating.

17, a cutting blade uses for the knife assembly of claim 16.

18, a rotary mower comprises a rotatable cutting knife, the drive unit of cutting knife, one cutting blade is with being pivotally mounted on the cutting knife, make that the cut surface on the blade is radially outwards outstanding, surpass cutting knife, the device of opening at the above pivot support frame location interval of described cutting knife, engage with cutting blade, stop cutting blade to comprise a skirtboard with cutting knife disengaging and protector in use, described cutting blade rotates therein.

19, according to the described protective cover of claim 1, it is characterized in that wherein the protective element of first assembly be with the circular supporting base of a part be an integral body, and extend radially outwardly with this.

20, according to the described protective cover of claim 1, comprise a shielding support and a cutter support, be characterised in that protective cover is located between supporting leg and the cutting blade to form one 0.5 centimetre to the position of the spacing of 3 cm range.

21, according to the described protective cover of claim 1, comprise a shielding support and a cutting blade support, it is characterized in that shielding support is to place like this, makes each described finger piece in use, at least 0.5 centimeters on the cutting blade plane of dangling.

22, according to the described protective cover of claim 1, comprise a shielding support and a cutting blade support, be characterised in that shielding support is to place like this, make the skirtboard of described second parts extend under the blade plane 3.0 centimetres to 5.0 cm range.

23,, it is characterized in that protective cover is with lightweight, anti-shake and elastic-plastic material is made according to the described protective cover of claim 1.

24, the holder part of rotary mower comprises a protective cover and a shielding support, and being characterised in that has many upright hoops in the support, respectively be used for removably putting into the protective element described in claim 10.

25, a support part of rotary mower comprises a protective cover and a shielding support, is characterised in that wherein protective cover and support form an integral body, and support has fixture, allows the fixture of the support on the machine can dismounting.

26, a support of rotary mower partly comprises a protective cover and shielding support, be characterised in that wherein protective cover and support have an elongated opening on a common radius, opening is to be used to place fixture, along with in opening, fixing fixture, with respect to support, adjust the circumferential position of protective cover.